<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<script>

    let vv = [{a: 1, b: 2, c: 3}, {a: 4, b: 5, c: 6}]
    let cc = [];
    vv.forEach(i => cc.push({skuId: i.a, num: i.b}))
    console.log(JSON.stringify(cc))

</script>

</body>
</html>